Innovation dollar clad error?

I recently found an innovation dollar in a bank roll. The obverse appears to be an attractive darker, reddish gold color than the reverse. Since it doesn't seem to be pure copper, I'm hesitant to say it is a missing clad error. Perhaps a thin clad error? Any help identifying this unique feature is greatly appreciated!

 

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It has a dark gold-ish color/metal reaction from something which is toining probably from being in a roll for a while.

 

not a mint error any type of copper is very sensitive/metal reactioning.

 

Missing Clad will look like this
Here are photos of missing clad layers:



Obverse missing clad layer. Click to enlarge






Reverse missing clad layer. Click to enlarge

Innovation and presidential dollars..
All have the same planchet composition.

 

The Clad is Copper and Manganese.

Composition Copper with manganese brass cladding: 88.5% Cu 6% Zn 3.5% Mn 2% Ni

 

Forgot about that don't deal/have alot of regular circulating coins this modern but welcome to the world of modern zombie metals in coins.

 

Take it out of the capsule and weigh it,
although it looks a lot more 'orange' than
'red copper core'.

 

Thank you everyone for your responses. I initially suspected toning, but it seems toning should have affected the reverse and edges somewhat. No other coins had the same toning in the roll. These photos show the coin in-between two other normal coins. Reverse and edges appear to match perfectly. The edge coloration of all coins seems to match the off colored coin obverse.

 

Thank you. I found the following thread which explains single sided toning. The quarter pictured here looks very similar.

https://www.cointalk.com/threads/single-sided-toning.202453/

 

Looks like the one side has toned and welcome to CT.